Collision Theory

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Year 11
Chemical reaction basics

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Collision Theory

  1. 1. Chemical Reactions
  2. 2. Chemical Reactions <ul><li>How do we know when a chemical reaction has occurred? </li></ul><ul><li>If new substances are formed, then a chemical reaction has taken place. </li></ul><ul><li>There are often signs that a chemical reaction is occurring. These include, light, heat, flames, smoke, gas production, a new smell, a colour change and the appearance of new substances. </li></ul>
  3. 3. Chemical Reactions <ul><li>Why do chemical reactions occur? </li></ul><ul><li>Substances are made of billions of incredibly small particles, either atoms, ions or molecules. For substances to react, their particles must collide . </li></ul><ul><li>For a collision to be successful, the particles must have sufficient energy, and they must be in right alignment. </li></ul>
  4. 4. Collisions
  5. 5. What factors affect the amount and the strength of collisions (reaction rate)? <ul><li>Surface Area </li></ul><ul><li>Concentration </li></ul><ul><li>Temperature </li></ul><ul><li>Catalysts </li></ul>
  6. 6. Reaction Rate <ul><li>Surface area </li></ul><ul><li>As we saw in our experiment, surface area greatly affects the _____ of the reaction. ________ the surface area increases the amount of atoms and molecules available for________, therefore increasing the rate of the _______. </li></ul>
  7. 7. Reaction Rate <ul><li>Concentration </li></ul><ul><li>Read yellow part of page 75 and summarise how concentration affects the rate of reaction and why. </li></ul>
  8. 8. Reactions Rates <ul><li>Why is increasing the rate of a reaction often advantageous in industry? </li></ul><ul><li>Brain storm in your book. </li></ul>

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